[Samba] Problems runing kinit on a (wannabe) secondary DC
Lorenzo Milesi
lorenzo.milesi at yetopen.com
Thu Jul 14 06:43:44 UTC 2022
I've installed a DC on Ubuntu 20.04 with Samba 4.15 using Van Belle's repos.
The DC is used for LDAP auth and working fine. It hasn't been tested for Windows clients auth, yet.
I'm attempting to configure a secondary DC, on a remote VPS withe same specs as above, but I'm unable to initialize kerberos communications. On the client I get the "classic" 'Cannot contact any KDC for realm ... while getting initial credentials', while from debug I'm unable to figure out what's going bad.
Active DC: 192.168.8.1 Samba 4.15.7-Ubuntu (dc-contabo)
Secondary DC: 192.168.1.206 Samba 4.15.7-Ubuntu (dc-lan)
root at dc-lan:~# KRB5_TRACE=/dev/stdout kinit Administrator
[987] 1657780070.241479: Getting initial credentials for Administrator at WDC.DOMAIN.IT
[987] 1657780070.241481: Sending unauthenticated request
[987] 1657780070.241482: Sending request (215 bytes) to WDC.DOMAIN.IT
[987] 1657780070.241483: Resolving hostname 127.0.0.1
[987] 1657780070.241484: Sending initial UDP request to dgram 127.0.0.1:88
[987] 1657780070.241485: Resolving hostname 192.168.8.1
[987] 1657780070.241486: Sending initial UDP request to dgram 192.168.8.1:88
[987] 1657780070.241487: Received answer (329 bytes) from dgram 192.168.8.1:88
[987] 1657780070.241488: Response was not from master KDC
[987] 1657780070.241489: Received error from KDC: -1765328359/Additional pre-authentication required
[987] 1657780070.241492: Preauthenticating using KDC method data
[987] 1657780070.241493: Processing preauth types: PA-PK-AS-REQ (16), PA-PK-AS-REP_OLD (15), PA-ENC-TIMESTAMP (2), PA-ETYPE-INFO2 (
19)
[987] 1657780070.241494: Selected etype info: etype aes256-cts, salt "WDC.DOMAIN.ITAdministrator", params "\x00\x00\x10\x00"
Password for Administrator at WDC.DOMAIN.IT:
[987] 1657780077.572430: AS key obtained for encrypted timestamp: aes256-cts/3E73
[987] 1657780077.572432: Encrypted timestamp (for 1657780077.598028): plain 301AA011180F32303232303731343036323735375AA105020309200
C, encrypted E3722A947D2C51C6E1DE8168FFE8454C2C57D19A957E468926BE799D9642A98A234B23B4C2DAEFDF8B9613E5CB0A59EB94D85720C63CF9CE
[987] 1657780077.572433: Preauth module encrypted_timestamp (2) (real) returned: 0/Success
[987] 1657780077.572434: Produced preauth for next request: PA-ENC-TIMESTAMP (2)
[987] 1657780077.572435: Sending request (295 bytes) to WDC.DOMAIN.IT
[987] 1657780077.572436: Resolving hostname 127.0.0.1
[987] 1657780077.572437: Sending initial UDP request to dgram 127.0.0.1:88
[987] 1657780077.572438: Resolving hostname 192.168.8.1
[987] 1657780077.572439: Sending initial UDP request to dgram 192.168.8.1:88
[987] 1657780077.572440: Received answer (201 bytes) from dgram 192.168.8.1:88
[987] 1657780077.572441: Response was not from master KDC
[987] 1657780077.572442: Received error from KDC: -1765328332/Response too big for UDP, retry with TCP
[987] 1657780077.572443: Request or response is too big for UDP; retrying with TCP
[987] 1657780077.572444: Sending request (295 bytes) to WDC.DOMAIN.IT (tcp only)
[987] 1657780077.572445: Resolving hostname 127.0.0.1
[987] 1657780077.572446: Initiating TCP connection to stream 127.0.0.1:88
[987] 1657780077.572447: Terminating TCP connection to stream 127.0.0.1:88
[987] 1657780077.572448: Resolving hostname 192.168.8.1
[987] 1657780077.572449: Initiating TCP connection to stream 192.168.8.1:88
[987] 1657780077.572450: Sending TCP request to stream 192.168.8.1:88
[987] 1657780101.669482: Terminating TCP connection to stream 192.168.8.1:88
kinit: Cannot contact any KDC for realm 'WDC.DOMAIN.IT' while getting initial credentials
On the primary, log.samba:
[2022/07/14 08:27:57.595905, 3] ../../auth/auth_log.c:647(log_authentication_event_human_readable)
Auth: [Kerberos KDC,ENC-TS Pre-authentication] user [(null)]\[Administrator at WDC.DOMAIN.IT] at [Thu, 14 Jul 2022 08:27:57.595895 CEST] with [aes256-cts-hmac-sha1-96] status [NT_STATUS_OK] workstation [(null)] remote host [ipv4:192.168.1.206:53256] became [DOMAIN]\[Administrator] [S-1-5-21-29876631-4178411864-4110581247-500]. local host [NULL]
{"timestamp": "2022-07-14T08:27:57.596084+0200", "type": "Authentication", "Authentication": {"version": {"major": 1, "minor": 2}, "eventId": 4624, "logonId": "d6850b4b1d4f33d4", "logonType": 3, "status": "NT_STATUS_OK", "localAddress": null, "remoteAddress": "ipv4:192.168.1.206:53256", "serviceDescription": "Kerberos KDC", "authDescription": "ENC-TS Pre-authentication", "clientDomain": null, "clientAccount": "Administrator at WDC.DOMAIN.IT", "workstation": null, "becameAccount": "Administrator", "becameDomain": "DOMAIN", "becameSid": "S-1-5-21-29876631-4178411864-4110581247-500", "mappedAccount": "Administrator", "mappedDomain": "DOMAIN", "netlogonComputer": null, "netlogonTrustAccount": null, "netlogonNegotiateFlags": "0x00000000", "netlogonSecureChannelType": 0, "netlogonTrustAccountSid": null, "passwordType": "aes256-cts-hmac-sha1-96", "duration": 4066}}
[2022/07/14 08:27:57.663338, 3] ../../auth/auth_log.c:647(log_authentication_event_human_readable)
Auth: [Kerberos KDC,ENC-TS Pre-authentication] user [(null)]\[Administrator at WDC.DOMAIN.IT] at [Thu, 14 Jul 2022 08:27:57.663328 CEST] with [aes256-cts-hmac-sha1-96] status [NT_STATUS_OK] workstation [(null)] remote host [ipv4:192.168.1.206:37690] became [DOMAIN]\[Administrator] [S-1-5-21-29876631-4178411864-4110581247-500]. local host [NULL]
{"timestamp": "2022-07-14T08:27:57.663603+0200", "type": "Authentication", "Authentication": {"version": {"major": 1, "minor": 2}, "eventId": 4624, "logonId": "4f496ebd9a181770", "logonType": 3, "status": "NT_STATUS_OK", "localAddress": null, "remoteAddress": "ipv4:192.168.1.206:37690", "serviceDescription": "Kerberos KDC", "authDescription": "ENC-TS Pre-authentication", "clientDomain": null, "clientAccount": "Administrator at WDC.DOMAIN.IT", "workstation": null, "becameAccount": "Administrator", "becameDomain": "DOMAIN", "becameSid": "S-1-5-21-29876631-4178411864-4110581247-500", "mappedAccount": "Administrator", "mappedDomain": "DOMAIN", "netlogonComputer": null, "netlogonTrustAccount": null, "netlogonNegotiateFlags": "0x00000000", "netlogonSecureChannelType": 0, "netlogonTrustAccountSid": null, "passwordType": "aes256-cts-hmac-sha1-96", "duration": 4787}}
Primary smb.conf:
# Global parameters
[global]
dns forwarder = 1.1.1.1
netbios name = DC-CONTABO
realm = WDC.DOMAIN.IT
server role = active directory domain controller
workgroup = DOMAIN
allow dns updates = disabled
interfaces = eth1
bind interfaces only = yes
server services = -dns
log level = 1 auth_audit:3 auth_json_audit:3 kerberos:10
tls enabled = yes
tls keyfile = tls/key.pem
tls certfile = tls/cert.pem
tls cafile = tls/ca.pem
[sysvol]
path = /var/lib/samba/sysvol
read only = No
[netlogon]
path = /var/lib/samba/sysvol/wdc.domain.it/scripts
read only = No
Secondary smb.conf is yet to be created.
Primary /etc/krb5.conf:
[libdefaults]
default_realm = WDC.DOMAIN.IT
dns_lookup_kdc = true
dns_lookup_realm = false
Secondary /etc/krb5.conf:
[libdefaults]
default_realm = WDC.DOMAIN.IT
dns_lookup_kdc = false
dns_lookup_realm = false
[realms]
WDC.DOMAIN.IT = {
kdc = 127.0.0.1
kdc = 192.168.8.1
}
Thanks
--
Lorenzo Milesi - lorenzo.milesi at yetopen.com
CTO @ YetOpen Srl
YetOpen - https://www.yetopen.com/
Corso Martiri della Liberazione 114 - 23900 Lecco - ITALY - | 4801 Glenwood Avenue - Suite 200 - Raleigh, NC 27612 - USA -
Tel +39 0341 220 205 - info.it at yetopen.com | Phone +1 919-817-8106 - info.us at yetopen.com
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